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Altera_Forum
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20 years ago

ioctl

In my application I'm using the JTAG UART as STDIO and one UART. The UART communicates with another application and the JTAG UART is used for service. My problem is that if there is no NIOS2-term...
Altera_Forum's avatar
Altera_Forum
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20 years ago

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originally posted by smcnutt@Oct 25 2005, 04:17 PM

hi andreas,

> has anybody an idea ?

if you set the "reduced device drivers" checkbox in the system library properties,

the ioctl operation is set to null ... in which case i believe the ioctl call will just return

-enotty.

regards,

--scott

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Hi Scott,

I think I get the answer to the problem.

I have to read out the AC Control BIT in the JTAG UART Control Register via IORD_AVALON.... The AC bit tells an external component is connected through the JTAG connector ( AC bit = set) or not. Once set it could only be reseted by writing a one to the AC bit. (see NIOS II Reference Handbook page 9-13).

Thank you for your help

Regards,

Andreas